Pipe-reaming attachment for pipe-threading tools



M. RICHMAN ET AL PIPE REAIIING ATTACHMENT FOR PIPE THREADING TOOLS Oct. 15, 1929.

Filed 001;. 11. 1927 H INVENTOR. ,v H. Leon; gvfaxwell Hickman;

Patented Oct. 15, 1929 v UNITED STATES PATENT OFFICE MAX RICHMAN, or BELVEDERE, AND HARRY n. anon, on res ANGELES, CALIFORNIA PIPE-REAMING ATTACHMENT FGR PIPE-THREADING TOOLS Application filed October 11, 1927. Serial No. 225,550.

Our invention relates to portable pipethreading tools commonly known as stocks and dies which are applied to the end of a cut length of pipe and manually rotated to form a screw thread exteriorly on and at the end of the pipe by which it can be coupled to another section of pipe. In cutting of the pipe, burrs are produced interiorly thereof and when two lengths of pipe are coupled one to the other, the interior burrs act as obstructions to the passage of liquid through the pipe. Threading tools as heretofore proposed make no provision for removal of the burrs, and consequently their removal necessitates an operation separate and independent of the thread cutting.

It is a purpose of our invention to provide an attachment for pipe-threading tools by which reaming of the pipe in order to remove the burrs is accomplished simultanenously with and by operation of the threading tool, thus upon completion of threading the pipe is devoid of all interior burrs and ready for installation.

We will describe only one form of reaming attachment embodying our invention and one form of threading tool to which it may be applied.

In the accompanying drawings:

Fig. 1 is a view showing in vertical section a pipe-threading tool of conventional form having applied thereto one form of pipe reaming attachment embodying our invention;

Fig. 2 is a vertical sectional view taken on the line 22 of Fig. 1;

Fig. 3 is a view showing the attachment in longitudinal vertical section;

Fig. 4 is a transverse vertical sectional view taken on the line 1-4 of Fig. 5; and

Fig. 5 is a view showing the attachment in side elevation.

In carrying out our invention, we provide a pipe-reaming device comprising a frame of substantially U form and including parallel portions 15 connected at one of their ends by a transverse portion 16. The free ends of the portions 15 are formed with right-angularly disposed ears 18 having openings through which studs 19 are adapted toextend for securing the frame as a unit to the thread-cutting tool.

As clearly shown in Figs. 3 and 4, the frame portion 16 is slotted vertically, as indicated at 20, and horizontally, as indicated at 21. Within the slot 21 a rack bar 22 is slidably received and on one end of this bar is secured a reaming element 23 which, in the presentinstance, is of conical form with its periphery provided with teeth 24 converging to the pointed end and having their cutting edges extending in a clockwise direction as when viewed in Fig. 2. Disposed within the slot 20, so as to have meshing relation with the teeth of the rack bar 22, is a pinion 25 fixed to the squared portion 26 of a shaft 27 journaled in the frame portion16 and pro vided at its projecting end with a knurled handle 28 by which the shaft and, consequently, the pinion may be manually rotated .in either direction to feed the rack bar. in

one direction or the other within the frame. A spring-pressed pawl 29 is pivoted on a pintle 30 mounted in the frame portion 16, and thisfpawl, by means of its, spring 31, is slidably urged into engagement with the pinion 25'so as to normally look the pinion against rotation in a counterclockwise direction and to thereby secure the rack bar against feedingmovement to the right, as when viewed in Fig. 3. It will, of course, be understood that the pawl 29 canbe manually moved'to a released position with respect to the pinion 25 so as to permit outward feeding of the rack bar 22. r

'By means of the rack. and pinion mechanism, it is possible to manually adjust the reaming element 23 in respect to the pipe to be reamed, and to aid the operator in securing an. accurate adjustment of the reaming element the handle 28 is provided with a pointer 32 (Fig.5), which is movable over a graduated dial 33, formed on'the face of a disk 34: secured to the frame portion 16 by means of pins35. Asshown in Fig. 4, the shaft 27 extends axially through the disk 34' so that the circular series or graduations on the face of the disk are'concentric to the shaft- In Fig.1, we have shown a conventional form of pipe-threading tool including a stock S and a die D. The stock in applied position to a pipe to be threaded is rotatable on the pipe, indicated at P, the end of the pipe being received Within the die D so that the threadforming portions thereof have thread-cutting engagement with the surface of the pipe when the stock is rotated manually by handles H.

The reaming attachment frame is secured to the outer side of the die D by the studs 19 so that the reaming element 23 is centered longitudinally with respect to the pipe P.

In operation, the threading tool is rotated on the pipe in the usual manner, the die D forming the threads on the end of the pipe. During rotation of the tool, the attachment is likewise rotated and with the reaming element 23 extending to the end of the pipe, as illustrated in Fig. 1, it will be clear that through rotation of the element its teeth will function to ream the pipe and thus remove all interior burrs therefrom. By constructing the reaming element in conical form, it is adaptable to pipes of different diameters, the element being adjusted inwardly with respect to the pipe to the required position by rotation of the handle 28 to actuate the pinion 25 in feeding the rack bar 22 forwardly toward the pipe. Once the reaming element has been positioned, the adjustment is maintained by the pawl 29 looking the pinion. against rotation in a direction to permit outward feeding of the rack bar.

From the foregoing operation, it will be manifest that we have provided a reaming attachment for pipe-threading tools by which the reaming of the pipe to remove internal burrs therefrom is effected concurrently with exterior threading of the pipe.

Although we have herein shown and described only one form of reaming attachment and one form of threading tool embodying our invention, it is to be understood that various changes and modifications may be made herein without departing from the spirit of the invention and the spirit and scope of the appended claim.

We claim:

A pipe reaming attachment comprising a U-shaped frame adapted to be secured to a pipe stock and having parallel portions and a connecting portion provided with angularly disposed communicating slots, a rack bar mounted for sliding movement longitudinally thereof in one of the slots of the frame, a reaming element fixed to an end of the rack bar and disposed between the parallel portions of the frame, a

shaft rotatable in the connecting portion of the frame and extending through the other of said slots a pinion fixed to the shaft and disposed within the other of said slots and meshing with the rack bar, a pawl pivotal-ly mounted in the other of said slots, a spring engaging the pawl and normally urging the latter into engagement with the teeth of the pinion ing element.

MAX RICHMAN. HARRY H. LEON. 

